Lock.



s. LIGAMMOR I.

LOOK.

APPLICATION FI ILED NOV. 1, 1910. 1,014,073. Patented Jan. 9, 1912.

INVENTOR 2 SHEETS-SHEET 1 COLUMBIA PLANOGRAPHYCO..WASHINGTON, n. c.

Patented Jan. 9, 1912.

2 sums-sum: 2.

ATTORNEYS coLynnlA PLANDCIRAIM 60.. WASHINGTON. I) c.

SALVATORE LIGAMMOB/I, O13 YORK, N. Y.

LOCK.

Specification of Letters Patent.

Patented J an. 9,1912.

Application filed November 1, 1910. Serial No. 590, 05.

To all whom it may concern:

Be it known that I, SALVATORE LIGAM- MORI, a subject of the King of Italy, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to looks.

One of the objects of the present invention is to provide a simple and practical lock applicable to doors, safes, and the like.

Another object is to provide a lock of the above character which will prevent anyone not familiar with the look from opening the same without causing an alarm to be sounded or exposing themselves to bodily injury.

A further object is to provide a lock of this character in which repeated warnings will necessarily be sounded before the lock is completely unlocked.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, wherei is shown one of many possible embodiments of this invention, Figure l is a vertical sectional View of a lock taken on the line AA, Fig. 2; Fig. 2 is a sectional elevational view taken on the line BB, Fig. 1; Figs. 3 and 4 are similar views taken on the line GC, Fig. 1, showing the lock in safety and set positions respectively. Fig. 5 is a detail sectional view on the line D-D, Fig. 2.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring to these drawings in detail, 1 denotes the base plate upon which the mechanism is mounted adapted to be secured to the door of a room,'for example, and is provided with a sliding bolt 2 adapted to engage a receiving recess 3 in the door amb 4. Hinged to the lower part of the base plate 1 at the point 5 is a casing 6 adapted to inclose the mechanism. This casing is locked in closed position by means of a bolt 7 sliding in the brackets 8 and normally held in a position to engage an opening 9 in the eas- 1ng 6 by means of a coiled spring 10. Mounted on the base plate 1 and at each side thereof are brackets 11 in which the bolt 2 is adapted to slide. This bolt 2 is provided on its lower edge with a plurality of notches 12- which are adapted to be engaged by a projection on the key when turned to move the bolt back and forth, These notches are also adapted to be engaged by an auxiliary bolt 13 normally held in engagement there- .with by a spring 14 engaging the end thereof.

Pivotally mounted at 15 is a bell crank lever having one arm 16 adapted to be engaged by a projection on the key when the same is turned upwardly, as shown in Fig. 2, while the other arm 17 engages a pin 18 on the auxiliary bolt 13 and forces the bolt downwardly against the action of the spring 14 so as to permit the bolt 2 being moved. The upper edge of the bolt 2 is provided with a mutilated gear 19'or rack adapted to engage a pinion 20 on a revoluble chamher or cylinder 21. This chamber is provided with a plurality of cylindrical openings each adapted to contain a cartridge. As the bolt moves in either direction the mutilated gear 19 rotates the pinion and chamber 21 so as to cause the openings to register with an opening or firing hole 22 in the base plate 1, as shown in Fig. 1. An intermediate barrel member 23 is preferably interposed between the face of the cylinder and the base plate. Adjacent each of the openings and on the periphery of the cylinder 21 are projecting lugs 24 adapted to engage a lever 25 pivoted at 26 and having its rear end engaged by a spring 27 so as to limit the revolving movement of the cylinder 21. This lever 25 is carried out of engagement with the lug 24 whereby the chamber is permitted to rotate as the bolt moves from right to left by means of a plurality of wedge-shaped lugs 28 on the bolt 2. It is thus seen that as the bolt moves from right to left the lugs 28 will take under the lever 25 and move the same about its pivot 26 so as tocarry the end of the lever 25 out of the path of travel of the lug 24. At the opposite side of the lock is a similar lever 29 pivoted at 30 and spring-held in engagement with a disk or cylinder 21 by means of a spring 31. This spring acts as a friction member to prevent a reverse movement of the cylinder 21. It is thus seen that when the key is inserted in the lock and rotated in a counter clockwise direction, Fig. 1, one of the projections on the key will first engage the end of the lever 16 and force the same upwardly, thereby depressing the opposite end 17 and carrying the auxiliary bolt out of the recess 12. As the key continues its rotative movement the same projection will engage in another recess 12 and move the bolt from right to left. This movement will cause a corresponding rotative movement of the cylinder 21 for the purpose now about to be described.

Directly behind the mechanism above described and protecting the same, is a second plate 32 having an opening therein around the hub 33 of the cylinder 21. Around this hub and rotatable with the cylinder are a plurality of curved cam members 34, which are adapted to engage a projection 35 carried by a spring hammer 36 pivotally mounted to the plate 32 at the point 37 These cam members 34 are so constructed and positioned wit-h relation to the projecti0n'35 as to cause the same to move outwardly or rearwardly away from the plate 32 as the cylinder rotates until they slip out of engagement with each other when the hammer 36 will spring back and drive a firing pin 38 through an opening 39 in the plate 32 to hit the cap on the cartridge and explode the same. It is of courseunderstood that the cartridges used in the cylinder may be either blank cartridges for the sole purpose of sounding an alarm or they may be ball cartridges with the intent to inflict bodily injury to the person trying to open the lock. As it takes several revolutions of the key to move the bolt completely from left to right it will take a corresponding number of turns to unlock the bolt or move the same from right to left, and at each turn of the key the above operation will take place and a cartridge will be exploded. The cylinder may be loaded through an opening 40 in the plate 32.

When it is desired to lock the door the I key is put way into the look, as shown in Fig. 1, and the outer projection thereof will engage a lug 41 on a slidable member 42, and

as the key turns the member 42 will be.

moved toward the left to carry the hammer 36 into the safety position shown in Fig. 3. When in this position the projection 35 on the hammer will be carried out of the path of travel of the cam members 34, thereby permitting the same to turn as the bolt 2 is moved to locking position. In order to move this bolt 2 it is necessary to partially withdraw the key so that the projection of the outer end thereof will co-act with the recesses 12 on the lower edge of the bolt 2. After the door is locked the key is then pushed way in to the position shown in Fig. 1 and given a reverse turn to move the bolt to the right, thereby carrying the hammer into set position, as shown in Fig. 4. It will thus be seen that anyone not familiar with the operation of the lock on attempting to turn the bolt will actuate the firing mechanism to explode the cartridge and notify those in the vicinity that an attempt is being made to break into the house. However; when the rightful owner returns he, of course, turns the alarm mechanism to safety position in the manner above described before attempting to open the door.

As the operation of this device is thought to be clear from the above description a further explanation thereof is thought to be unnecessary. It is thus seen that this mechanism accomplishes, among others, all of the objects and advantages above set forth in a suitable and practical manner.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention, which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is:

1. In a device of the character described, in combination, a slidable bolt, an alarm mechanism including a revoluble cylinder adapted to hold a plurality of cartridges, means for exploding said cartridges, means connecting said cylinder with said bolt whereby the same is rotated as the bolt is moved, and means adapted to co-act with said exploding means for moving the same to safety position, said means including a slidable member adapted to be actuated by the key for the lock.

2. In a device of the character described, in combination, a slidable bolt, having a gear along one edge, an alarm mechanism including a revoluble cylinder and a pinion meshing with said gear, said cylinder having a plurality of holes therein, each adapted to receive a cartridge, means for exploding said cartridges, and means for actuating said exploding means as said bolt is moved to unlocking position.

3. In a device of the character described, in combination, a plate, a bolt slidable thereon having a gear along one edge, an alarm mechanism including a revoluble cylinder having a pinion meshing with said gear,

said cylinder having a plurality of holes In testimony whereof I aifix my signatherein, each adapted to receive a cartridge, ture, in the presence of two Witnesses. means for exploding said cartridges, means for actuating said exploding means as said SALVATORE LIGAMMORI' bolt is moved to unlocking position, and Witnesses:

means for moving said exploding means to ROYAL W. FRANCE,

safety position. PAUL A. BLAIR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

